mirror of
https://github.com/git/git.git
synced 2024-11-05 00:37:55 +01:00
100c5f3b0b
This replaces the fairly odd "created_object()" function that did _most_ of the object setup with a more complete "create_object()" function that also has a more natural calling convention. Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Junio C Hamano <junkio@cox.net>
76 lines
1.7 KiB
C
76 lines
1.7 KiB
C
/*
|
|
* alloc.c - specialized allocator for internal objects
|
|
*
|
|
* Copyright (C) 2006 Linus Torvalds
|
|
*
|
|
* The standard malloc/free wastes too much space for objects, partly because
|
|
* it maintains all the allocation infrastructure (which isn't needed, since
|
|
* we never free an object descriptor anyway), but even more because it ends
|
|
* up with maximal alignment because it doesn't know what the object alignment
|
|
* for the new allocation is.
|
|
*/
|
|
#include "cache.h"
|
|
#include "object.h"
|
|
#include "blob.h"
|
|
#include "tree.h"
|
|
#include "commit.h"
|
|
#include "tag.h"
|
|
|
|
#define BLOCKING 1024
|
|
|
|
#define DEFINE_ALLOCATOR(name, type) \
|
|
static unsigned int name##_allocs; \
|
|
void *alloc_##name##_node(void) \
|
|
{ \
|
|
static int nr; \
|
|
static type *block; \
|
|
void *ret; \
|
|
\
|
|
if (!nr) { \
|
|
nr = BLOCKING; \
|
|
block = xmalloc(BLOCKING * sizeof(type)); \
|
|
} \
|
|
nr--; \
|
|
name##_allocs++; \
|
|
ret = block++; \
|
|
memset(ret, 0, sizeof(type)); \
|
|
return ret; \
|
|
}
|
|
|
|
union any_object {
|
|
struct object object;
|
|
struct blob blob;
|
|
struct tree tree;
|
|
struct commit commit;
|
|
struct tag tag;
|
|
};
|
|
|
|
DEFINE_ALLOCATOR(blob, struct blob)
|
|
DEFINE_ALLOCATOR(tree, struct tree)
|
|
DEFINE_ALLOCATOR(commit, struct commit)
|
|
DEFINE_ALLOCATOR(tag, struct tag)
|
|
DEFINE_ALLOCATOR(object, union any_object)
|
|
|
|
#ifdef NO_C99_FORMAT
|
|
#define SZ_FMT "%u"
|
|
#else
|
|
#define SZ_FMT "%zu"
|
|
#endif
|
|
|
|
static void report(const char* name, unsigned int count, size_t size)
|
|
{
|
|
fprintf(stderr, "%10s: %8u (" SZ_FMT " kB)\n", name, count, size);
|
|
}
|
|
|
|
#undef SZ_FMT
|
|
|
|
#define REPORT(name) \
|
|
report(#name, name##_allocs, name##_allocs*sizeof(struct name) >> 10)
|
|
|
|
void alloc_report(void)
|
|
{
|
|
REPORT(blob);
|
|
REPORT(tree);
|
|
REPORT(commit);
|
|
REPORT(tag);
|
|
}
|